Abstract: According to the single suitable diling technique, low control accuracy, and removing difficulty of the present separated component type full hydraulic tu nnel drilling rig and the long auxiliary operation time problem of the present crawler type full hydraulic tunnel drilling rig, the load feedback, constant-pressure variation and remote control technology was applied to the design of the hydraulic system of the ZDY6000LD (A) mode crawler type full hydraulic tunnel drilling rig, including the rotation, feeder, travel, main shaft braking and other performance return lines as well as the drilling tools down and up, clamped rotation, clamping releasing and other li nkage functions.With the application of the AMESim software, a simulation analysis and site application was conducted on the load features of the reverse rotation retur n circuit.The results showed that the theoretical features of the load sensitive system would be well fitted with the actual drilling performances.The ZDY6000LD (A) mod e drilling rig could be suitable for the rotation driling, directional drilling, complex drilling and other drilling techniques and the hydraulic system could have a high techni cal adaptability, an energy saving and a remote operation control.